If the main camera add a render layer

ZipZapWxh · March 25, 2020, 4:32pm

I add a custom layer to main camera. then the screenToWorld function return a wrong direction.
In fact this custom layer is useless for me, but I just wanna know the reason why it’s will make the function gives a wrong direction?

Leonidas · March 25, 2020, 4:36pm

Hi @ZipZapWxh,

It shouldn’t happen, this method shouldn’t be affected by the layers the camera is rendering to.

Are you able to to provide a sample project that reproduces the issue? Sounds like a bug if that’s the case.

Here is the function signature:

github.com

playcanvas/engine/blob/6923c43fc8a147b9ee5df37cda010ba3262d5db2/src/scene/camera.js#L150


 * @name pc.Camera#screenToWorld

 * @description Convert a point from 2D canvas pixel space to 3D world space.

 * @param {number} x - X coordinate on PlayCanvas' canvas element.

 * @param {number} y - Y coordinate on PlayCanvas' canvas element.

 * @param {number} z - The distance from the camera in world space to create the new point.

 * @param {number} cw - The width of PlayCanvas' canvas element.

 * @param {number} ch - The height of PlayCanvas' canvas element.

 * @param {pc.Vec3} [worldCoord] - 3D vector to receive world coordinate result.

 * @returns {pc.Vec3} The world space coordinate.

 */

screenToWorld: function (x, y, z, cw, ch, worldCoord) {

    if (worldCoord === undefined) {

        worldCoord = new pc.Vec3();

    }



    if (this._projMatDirty || this._viewMatDirty || this._viewProjMatDirty) {

        var projMat = this.getProjectionMatrix();

        var viewMat = this.getViewMatrix();

        this._viewProjMat.mul2(projMat, viewMat);

        this._viewProjMatDirty = false;

    }

ZipZapWxh · March 25, 2020, 4:40pm

Emmmm… Maybe I cannot provide the project to you cause I already changed a lot of code. But I can make some screen shots about the layer , camera and code for you .

Leonidas · March 25, 2020, 4:44pm

Yes, what would be useful then is if you can post the steps that reproduce the issue. To try and replicate this on a project of mine.

ZipZapWxh · March 25, 2020, 4:45pm

ZipZapWxh · March 25, 2020, 4:46pm

The culprit is layer(Minimap).
Maybe my layer setup is wrong.

Leonidas · March 25, 2020, 4:48pm

Try reloading your launch window after you add/remove layers.

ZipZapWxh · March 25, 2020, 4:50pm

Yes. I already did it. this bug torture me for couple of days.

Leonidas · March 25, 2020, 4:51pm

If you find this is a showstopper for you app and seems like a Playcanvas bug, try to create a simple project that reproduces the issue.

Not sure I can do that out of context given that info, but if you can provide that we can easily debug it.

ZipZapWxh · March 25, 2020, 5:14pm

Sure.There is a template project : https://playcanvas.com/editor/scene/893865
I am missing some steps before, there are two camera , one for main camera another for render to texture.

Leonidas · March 25, 2020, 7:44pm

Thanks @ZipZapWxh for providing this.

What are the steps to reproduce the issue?

Clicking on the cubes works, when launching the app (camera moves from one cube to the other).
Removing the Minimap layer, clicking to move still works.
Adding back the Minimap layer, same behavior, clicking to move works.

ZipZapWxh · March 26, 2020, 4:33am

Did you find something unusual? I can make some changes for you.
https://launch.playcanvas.com/893865?debug=true
The white box’s position is the raycast result.point

Leonidas · March 26, 2020, 7:15am

Mmm no, the white box is positioned correctly both with the Minimap layer added to the camera and without it.

Does it work like this for you as well? Everything seems to be fine.